If you're the original owner of it, def give Horizon Hobby a call and try ot get it covered by warranty. That's an unusual thing to break and not something you likely could cause by mis-use.
Even if you aren't original owner, HH is probably you're only source for a replacement part. For something like that they may not ship you the part, and instead require sending in for service. If you have a hobby shop nearby that deals in HH gear, see if they can order the part. Sometimes they'll do that for dealers whereas they will not for end users.